Hi
Welcome to the forum.
I would say definitely change your money out there. You will get a much better rate and there are many places to get change. People recommend the supermarket below the
ICR offices in the main square for good rates.
Also bear in mind that sterling is accepted in many places and can be useful in bartering for that bargain.
As for the heat, You can count on HOT.
My son and I fly out on Thursday so will be out there the same time as you guys so have a fab time, as I'm sure we will
Cheers
Rog